For optimal flavor, marinate the steak in a simple Greek marinade (olive oil, lemon juice, garlic, oregano) for at least 30 minutes before grilling. Consider adding a layer of cucumber or bell peppers for added crunch and nutrients. To serve, simply invert the jar into a bowl and gently shake to release the contents. Toss with the optional croutons and enjoy immediately. If you don't have Mason jars, any airtight containers will work. Just be sure to layer the ingredients in the order specified to prevent the lettuce from wilting.